Valve



Patented Nov. 3, 1925.

UNITED vSTATES `PATENT OFFICE. i

MILON J TRUMBLE,OF ALHAMBRA, CALIFORNIA, ASSIGNOR TO BROWN VALVE AND MANUFACTURING CO., OF ALHAMBRA, CALIFORNIA7 A CORPORATION OF CALI- FORNIA.

Application filed October 16, 1922.

devices and particularly to valve means for controlling the flow of liquid substances, especially those which carry abrasive materials in suspension. Although the valve has a particular utility as an outlet valve for controlling the How of sand bearing oil from gas traps and similar devices which are employed in the petroleum oil` producing industries, it is of 'utility with other fluids.

It is an object of the invention to provide a valve which will not be materially affected in operation by the presence of sand in the liquid flowing therethrough.

It is a further object of the invention to provide a valve which will maintain a substantially tight closure under varying conditions of pressure.

It is a further object of the invention to provide in this valve an arrangement in which the Wear receiving parts may be quickly and cheaply renewed.

It is a further object of the invention to provide a valve of this character which is extremely simple in construction and therefore economical of manufacture.

It is a further object of the invention to provide a valve having a spring retained closure plate and means for moving the closure plate over the discharge opening.

The particular advantages of the invention and further objects thereof will be made evident hereinafter.

Referring to the drawing which is for illustrative purpose only,

Fig. 1 is an elevational View of a valve embodying the features of the invention.

Fig. 2 is a vertical longitudinal section through the valve shown in Fig. 2.

Fig. 3 is a section taken upon a plane represented by the line 3 3 of Fig. 2, and,

Fig. 4 is a section taken upon a plane represented by the line 4 4 of Fig. 2.

As shown in the drawing a body 11 is provided having a threaded inlet 12 which leads into a recess 14 adapted to be covered by a cover plate 15 which is secured there- VALVE.

Serial No. 594,759.

upon by cap screws 16 or other suitable devices. Y The cover plate 15 has a hub 18 formed thereupon through which the valve outlet passage 19 extends. This passage 19 1s enlarged and threaded at the outer end, as indicated at 20, so that a discharge. pipe may be attached thereto.

The inner faceV 25vof the closure plate 15 is machined off to .a substantially true and smooth plane, and a closure plate 26 is provided which is adapted to be moved back and forth upon the surface 25 by a gear segment 28, mounted upon a shaft 29, in

be caused to cover or expose the outlet passage by suitably reciprocating the handle 30 such a manner that the closure plate may,A

mounted upon the outer ends 31 of the shaft 29 which extends throughv a packingfbox provided with a gland 33 which may be tightened down upon the packing contained 1n the packing box by means of bolts 34.

As shown in Fig. 3 of the drawing the' inner end 37 of the shaft 29 seats in. a recess 38 formed in the` wall of thebo'dy 11,

opposite to the packing box 32. lA cylindrical enlargement 39 is provided substan-V shaft extends outwardly through the/.pack-y ing box 32 and the gland 33,- the packing material being compressed againstthe shoulder 40'separating the enlargement 39 and the end 31, and being compressed against that portion ofthe extending end 31 adjacent to the shoulder 40, thus accomplishing a liquid seal around the shaft 29 and further holding the shaft 29 in place due to the compression of the packing against the shoulder'40.

This construction provides a very simple means for installing the gear segment 28 and the shaft 29, as the segment 28 may be placed within the chamber 14 and the squared inner portion 42 of the shaft extended through a squared hole 43 provided in the member 28. With the use of such construction a single packing gland is employed and no additional means are required for maintaining the segment and the shaft 29 in working position.

A particular feature of the invention is the provision of a pair of arch spring members 45, preferably self-retaining, as shown, the ends 46 of which members are received upon shoulders 47 formed in the corners of the recess 14C, and the interconnecting arch portions of Which bear against the underside of the plate 26, one spring being disposed upon each side of the rack 51 by Which engagement of the plate 26 is made with the gear segment 28. When the elements are assembled as illustrated, the arch portions 50 of the spring members are substantially flat, each simultaneously exert substantially the .same degrees of pressure upon the closure plate so that there is no tendency of the plate to tilt. lt is Well known that an arch spring has a greater`- degree of resiliency at its medial portion than near its ends when said ends are fixed, and it follows that when flexed such end portions Will exert a pressure which is greater than that exerted by said medial portion. lt will therefore be evident that the curved end portions of the springs l5 Will be considerably stiffer than the arch portions -50 and that as the valve plate moves to closed position the springsWill exert an increasing pressure against the plate as said plate approaches its closed position and engages the relatively stiffer lower end portions of said springs, This, in effect, provides a valve having the inherent advantages of a Wedge-platey valve mechanism, Without placing an overburden upon the valve operating mechanism, and Without having the Wedge-plate tendency to stick.

The particular advantage of theV springs l5 is that the closure plate is maintained forcibly against the surface 25 of the cover plate 15 so that a non-lealrable closure of the outlet passage 19 is provided no matter what pressure exists in the reservoir from which the liquid is being drawn.

It Will be understood that as the pressure behind the closure plate 26 increases, the more tightly it is held over the outlet passage 19, so that the resistance against lealtage increases with the pressure exerted upon the liquid beingcontrolled; but Where extremely lovv pressures are being handled, l have found it necessary to employ springs for the purpose of maintaining a tight closure between the closure plate 26 and the .surface 25 of the cover plate.v

The invention may be employed with various fluid substances, a very valuable use thereof being as a blow-ofi1 valve for steam boilers, and may be used successfully With substances of varying densities.

l claim as my invention:

l'n a sliding plate valve, the combination of: a valve body having an inlet and an outlet and being provided with a valve seat surrounding said outlet; a vertically slidable valve plate normally closing said outlet and having a rack formed on its inner surface; a gear engaging said rack; means for rotating the gear to translate said valve plate; and a pair of impcrforate leaf springs maintaining the valve plate against its seat,

the respective springs engaging said valve 

